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QSOnscreen is the utility for measuring areas and lengths from screen images of your drawings. Accuracy is comparable with many expensive digitisers and better than old style planimeters.
If you use Calculix, you also have the benefit of importing room data directly into it from QSOnscreen's Calculix Mode. In Cut and Fill Mode you can enter existing and finished levels onto your outlined areas then calculate earthworks and disposal volumes at the press of a button.